The fastest possible conduction velocity of action potentials is observed in
A)thin,nonmyelinated axons.
B)thin,myelinated axons.
C)thick,nonmyelinated axons.
D)thick,myelinated axons.

Question

Quizplus · Accepted Answer

Thicker, myelinated axons have the fastest possible conduction velocity because myelin acts as an insulator and forces the action potential to jump from one node of Ranvier to the next, a process called saltatory conduction. This allows the action potential to travel quickly down the axon without depolarizing every segment of membrane.

The Fastest Possible Conduction Velocity of Action Potentials Is Observed